Hi Siobhan, EGDeepher,
Here is how you make a signature.
1. Click User cp
2. Click Edit profile
3. In the signature optional type {SIZE=6}{B}{COLOR="purple"}{FONT=symbol}DFE{/FONT}{/COLOR}{/B}{/SIZE}
Substitute [ and ] for { and } and you have this
DFE. You can change the color and size if you want. I hope that helps.